Paint spray



Oct. 10, 1933.

w. A. DE HART PAINT SPRAY Filed Aug. 2. 1929 2 Sheets-Sheet 1 @afb/1%@ Oct. 10, 1933. w, A DE HART 1,929,882

PAINT SPRAY Filed Aug. 2, 1929 2 Sheets-Sheet 2 Patented Oct. 10, 1933 PAINT SPRAY William A. De Hart, Teaneck, N. J.

Application Aulllst 2, 1929. Serial No. 382,896

13 Claims.

The present invention relates to improvements in the form of spraying devices that is commonly employed in connection with the exhaust or blower end of a vacuum cleaner, a pipe connecting the vacuum cleaner with the air supply tube of the spraying device to afford suiilcient air under pressure to actuate the spray. Various spraying devices of this type have been placed upon the market with more or less success, but their cost of manufacture has necessitated selling them at such a high retail price that they have not been as commonly used as might otherwise be. One of the purposes of the present invention is to produce a simple form of spray that can be cheaply manufactured and sold for a relatively small cost comparable/with the price of a good paint brush, such spray devices being used largely for spraying on a coat of paint.

To this end, I have produced an improved spraying device in the form of an attachment for a jar-like container, the device being made up upon a removable metal container top. The top carries a iiuid delivery tube which passes through the top and extends sufficiently below to reach nearly to the bottom of the container, the spray nozzle being mounted on the outer end of this fluid delivery tube. The top also carries a tubular air exhaust extending through the top and formed with a lateral outlet opening just above the top. An air supply port also extends through the top to supply air under pressure upon the iiuid in the container. An air chamber of tubular form is mounted upon the top to enclose the tubular air exhaust and the air supply port,

`said tubular air chamber-being adapted to be attached to some suitable supply of air under pressure, such as the exhaust or blower pipe of a vacuum cleaner above referred to, and the inner end of this tubular air chamber is closed by a head which is formed with an air spray supply port and a port that registers with the lateral outlet opening of the tubular air exhaust. A twopart valve is mounted upon the inner face of this air chamber head, one part of the valve being a valve plate that normally closes the air spray supply port, while the other part of the valve comprises the stem that fits and slides in the tubular exhaust and closes the lateral opening thereof when the air spray supply port is opened. This valve is manually operated. The air chamber not only supplies air under pressure for the spray nozzle, but air passes from the air chamber through the air supply port into the container for forcing the fluid up into the iluid delivery tube. Y

A feature of the present invention consists of a, combined spray nozzle and air pipe which are secured together in the critical angular relation that has been found from practice to produce the best results. The spray nozzle projects into the delivery end of the air tube at approximately a right angle or less, the opening of the nozzle being preferably inclined slightly away from the direction of the air current. The nozzle tube telescopes or ts over the outer end of the fluid delivery tube, while the air pipe combined therewith is flanged to lit the correspondingly flanged delivery port in the head of the air chamber, the engaging flanges of the air pipe and fitting ends of the nozzle and delivery tube being arranged in parallel planes so that the combined nozzle and air pipe can be readily mounted and demounted. By arranging this removable combined nozzle and air spray pipe, it is possible to use different sized spray nozzles for different 'Il classes of work, a feature of great practical importance.

The spray nozzle is preferably provided with a wire or fin projecting from its delivery side approximately parallel with the line of blast through the air pipe. This iin or wire concentrates the discharge from the nozzle and prevents the objectionable spread of the spraying fluid to the nozzle surface below its opening. The air spray tube terminates approximately in the plane of intersection of the nozzle. It is important that this air tube extend up to the nozzle to properly concentrate the stream of air, but it should not project beyond the nozzle. l

In addition to the device as described, I provide 0 a modied form of spray nozzle in which the spray can be directed at a slight angle downwardly from the normal plane of the container top. This modified form also embodies means for removably mounting the spray nozzles to obtain the diiferent sizes of spray for different work.

In order that the invention may be fully understood, it will first be described with reference to the accompanying drawings, and afterwards more particularly pointed out in the annexed claims.

In said drawings,

Figure 1 is a vertical, longitudinal, sectional view of the improved spraying device.

Figure 2 is a similar view showing the control- 105 ling valve open for the spraying operation. Figure 3 is a plan view of the device. Figure 4 is an end view 'of the device. Figure 5 is a top plan view of the modined container top-with the spray devices removed.

- gitudinal section of a modified form of spray nozzle; and

Figure 10 is a similar view showing a further modification of the improved spray nozzle.

The vessel or container indicated at 1 may be an ordinary glass jar of the proper size to contain the liquid substance that is to be sprayed. A suitable consistency of paint can be successfully sprayed in this type of device. Thejar or container 1 has screwed, or otherwise detachably mounted upon it, a top or cover member 2, and upon this metal top 2 the improved spraying device is mounted.

The top 2 supports a fluid delivery tube 3 which extends through the top, 4is sealed thereto, and projects down into the container or jar 1, as shown particularly in'Figur'e 1. This tube 3 also extends upwardly a short distance above the top 2 for the reception of the spray nozzle, presently to be described. The top 2 also carries an air exhaust tube 4 which projects slightly above and below the cover 2, this tube 4 having a lateral outlet opening 5 just above top 2. An air supply port 6 is formed in the raised portion 7 of struck-up cover 2, said air supply port being presented toward the stream of air under pressure carried by the air chamber, presently to be referred to.

It will be understood that the top 2 carries the usual vpacking or gasket 8 which is perforated to with the inlet air'opening 6.

As shown particularly in Figure 5 of the drawings, the top 2 is reinforced by means of a rib 9' struck-up from the metal of the top, said reinforcing rib being of modied U-shape in plan view.

is a tubular air chamber having its bottom wall slightly cut away and flat near its inner end to'flt upon the container top 2 between the two lugs of the reinforcing rib 9', said tube 10 being rigidly secured in place upon top 2 by soldering or brazing. The open end of the tubular air chamber 10 is closed by means of a semi-circular head 1l having a curved flange 12 fitting snugly upon the end of the tube 10, and with integral lugs 13 projecting downwardly in position to pass through the spaced slots 14 formed through the top 2 upon opposite sides of the tube 4. These lugs 13 are bent over against the inner face of the top 2 and flanged head 11 is tightly soldered to the -tube 10 and top 2. Head 11 carries a rearwardly projecting curved bracket 14y having an integral lug 15 which is bent downwardly and .passes through a transverse slot 16 in the top of the tubular member 10. This bracket 14 of head 11 and the wall of tube 10 are perforated, as indicated at 17, to receive the upwardly projecting rod 18 carrying at its outer end nger piece 19, and supporting between the finger piece 19 and bracket 14 an expansion spiral spring 20. Suitably secured to the inner end of rod 18 is an arm 21 projecting rearwardly from a slide vvalve plate 22 which slides upon the inner face of head 11 and normally closes the outlet port 23 through which passes the air to the spray nozzle. Extending downwardly from the slide valve plate 22 is a stem 24 which fits and slides in the tubular exhaust 4, and when the valve 22 is pressed down to open up the air spray outlet port 23, said valve stem 24 will extend over and close the lateral opening of tubular exhaust 4.

The anged head 11 is also formed with an exhaust port 25 which registers with'the lateral opening of exhaust tube 4, the metal of head 11 being cut out to form the port 25, the cut-out metal strip being bent around tube 4 to assist in holding the parts rigidly together as indicated at 26.

As stated above, an improved feature of the present invention is the provision of a combined nozzle and air pipe. In its simplest form this is shown in Figures 1, 2, 3, 4 and 8, in which figures, 27 is a nozzle tube having a contracted or conical upper end terminating in a restricted discharge opening 28. This nozzle tube 27 fits snugly the bore of the upper end of the fluid discharge tube 3, while a concentric short section of tubing 29 surrounding tube 27 iits over the upper end of the discharge tube 3. The conical end of nozzle tube 27 is inserted radially into a larger air conducting tube 30, a suitable opening being provided in the wall of tube 30 near its outer end to receive the nozzle tube. The discharge opening 28 of nozzle tube 27 is presented in the critical position, discovered by experiment and found to be approximately in the longitudinal axis of the air tube 30. It will be understood that the concentric tubes 27 and 29 are rigidly soldered or brazed to the air conducting tube 30. As shown in the drawings, the spray nozzle 27 and spray air supply tube 30 are rigidly secured together in approximately right angular relation. This angular relation may be altered slightly so long as the discharge opening of the spray nozzle is not directed toward the oncoming stream of air. It will further beobserved with reference to Figures 1, 2 and 3 of the drawings, that the air spray conducting tube 30 is cut back a slight angle from the bottom so as not to project beyond the outlet opening of the spray nozzle. It is desirable to have this tube 30 extend up to the spray nozzle to concentrate the action of the air upon the nozzle.

Another feature of importance in the spray nozzle is the provision of a small wire or fin, indicated at 31, extending from the delivery side of the conical end of the nozzle tube adjacent ,to the discharge opening, and extending in the line of the longitudinal axis of the air supply tube 30. This member 3l concentrates the fluid delivered from the nozzle until broken up into the spray, and prevents the uid creeping downwardly over the conical surface of the nozzle.

It will be observed that the air outlet port 23 through the head 1l is of approximate U-shape with the metal of the head 11 shaped into a coupling iiange 32. The inner end of the air spray conducting tube 30 is formed with an annular flange 33 which ts snugly the coupling flange 32 and holds the tube 30 in registry with the port 23 so that air passes from the tubular chamber 10 through port 23 and is directed over and around the conical discharge end of the spray nozzle. The interlocking anges 32 and 33 are arranged parallel with the telescoping nozzle tubes 27and 29 so that in mounting or dismounting'the combined nozzle and air tube, the moveles ability greatly facilitates the exchan'geof nozzles to suit the work to -be performed.' f In the form of nozzle described, it will-be observedl that the air spray supply -tube is `di rected horizontally or parallel with-y topZ; This is a convenient form for'painting 'manyobjecta but is an'inconvenient form forpainting horizontalsurfaces such asa floor orthetopiof-v-a desk, in which case it is desirable tdbefable'to play the spray in a downward direction vwithout tipping over the container so far-as 'to interfere with theoperation. For-'j this downward direction of the spray, I may useoneioftheniodi'ed forms shown in Figures 9 and -10 of the drawings'. i In Figure 9, the air spray supply tubelin'di-l cated `'as 30a' is somewhatlonger'thanathe tube heretofore referred to, but isf'mounted upon-the head 11 of the airchamber10-in-thesamemanf ner as above described, the coupling angebein'g shown at' 33a. The discharge ed-of this air tube 30a is provided with an elbow at 34,iconnecting' with -a short downwardly inclinedipipe section 35, whilethe nozzle tube -27f'lisI ofangularsh'ape extended parallel with air tube '30L and lhaving its discharge opening 428m-presented horizontally in the center of the angular discharge fnd of the air tube.'y -With this device,V the spi-aysis' directed downwardly when the apparatus-isheld in normal position with the container' l1`-upright In Figure 10, the device is furtherm'dfied-to include the features-1 of@projectingfthe-spray downwardly in combination-with'interchangeable spray nozzles. In this form the air-spray delivery tube 30b is supported by lits annularfcoupling flange 33b inthe mounting hereinbeforee'xplained. The delivery end of tube-130lil cut back at an angle as shown, its angular end being formed with an approximately `U-shaped coupling ange 36 of the same charact'eiia's the coupling flange 32, above-referred tor* Securedv to the under surface ofthe "air spray-conducting tube 30b is a tubular thimble 37 projecting down# wardly in positionto snuglyffit ovr-'lthe'upper end of the uid'supply tube '3l --"Ihis"tubular thimble 37 carriesan angulartubularextension 38 which communicatesthrough the -port 3a' with the fluid supply tube 3,' and conducts fluid to.l be sprayed therefrom. At the' outer end-loffthis angular tubular extension 38 is anupwardly'presented tubular nipple 39 in communicationwith 38, and of the proper size to receive thenozzle tube 27 and auxiliary concentric tube 29 ofithe nozzle attachment abovev described.- .40.. isfa screw threaded into the end of the tube 38 to close the end and permit access when it is desired toclean the parts.

With this modification of Figure l0, it will be observed that the combined nozzle and air tube of the form shown in Figure 8 can be readily mounted by sliding the annular coupling flange 33 into engagement with the flange 36 of air tube 30, while the tubes 27 and 29 are telescoped with the fluid extension nipple 39. In this way, the combination nozzle attachment for producing a spray of the desired size may be readily mounted upon the device to aiord a downwardly acting spray.

In operating the spray, a fluid paint for ini stance, it will be understood that after the paint is placed in the container, and the top screwed firmly in place, and the nozzle attachment of the desired size mounted, it is only necessary to start up the air pressure device of whatever form may be used which supplies air under pressure into the tubular chamber 10. In normal inoperative position,1it -will befunderstood' that'air will en terthe container-'andabove rthe/fluid .to be sprayed, but will.readily-mass"out-"through the tubular ex'- haust-forf so longa'szthe combination valve is in itsn'ormal position. .':Whenit isi desired to cause the spray to act', the operator presses downward upon therfingerl piece 19, opening communication with theair-spray supply-tube 'and closing the outletthrough fair exhausttube 4, with the result thatair entering the container 1 willlforce the fluidup the pipa-3 tothe'spr'ay'nzle from :which it -is sprayed by the .passingvof currents 'of air over the'.nozzleif-Aslongasthe valveis heldyin the describedposition, and iuidre'rriains `in thecon, tainer=,.-th'e=spray will v'operate'.-1 In closing oi the spraying operation, the parts. are so arranged that the'exhaustthrough tube 4 willstart to open to-y relieve r the-containericf the.' pressure of the airi-beforeithefair spray: supply pipe is closed. 'important so astocontinue the blast of air vacross'theispray nozzle until all possibility of fluid risingin'l the nozzle'is passed.

',- 1Ic1aim: =,.n i L i y 1 -A'sprayingfattachmentfor containers comprising. alremov'able'metal containerv top, a fluid delivery tubeprojectingfabdveA and below the contaiher-='top',-'a i tubular`1= air exhaust. projecting through saidfop andfhaving'alateraloutlet opening', 'an air'- supply-port throu'ghsaid top, a tubular chamber? fri airllurderflpressure mounted upon theiupperfface'fofs'aidlcontainer `top and enclosing-said'ftubular air-exhaust and said air supply portfalshea'd frs'aidtubularairchamberhaving an-air-spaysupply port and a port registering haust,"atwdfpartmanually operated slide valve iri'dnted'fupon`said `ai r :chamber head, one part ofx sa'id' valve comprising a Y"valve plate normally closing'said'air spray supply port' and the other partof said valve comprising a stem projecting fromfsaid vvalve'jplate'-an'dsliding in the tubular airVexhaustf-toclose" its lateral outlet opening when-the a'ir spray Aoutlet port is opened, and a combined sprayffnozzle-and air supply pipe in coxrimuication 'respectively with said fluid delivery' pipe and 'said air spray outlet port.

2.4 In a device of the character described, the combination with a container having a fluid outletfand 'aniair-supply port, and a chamber for air under pressure having an air spray supply portfof a-unit comprising'the relatively xed iiuld spray nozzle`- and airdelivery tube, the spray nozzle ofi'said unit detachably communicating with said fluid outlet and th'edelivery tube of said unit fdetachably vcommunicating with said air spray supply port.

3. In a device of the character described, the combination with a container having an air supply port, a uid outlet for said container, and a chamber for air under pressure having a valved air delivery port, of the combined fluid spray nozzle and air delivery tube having xed angular relation and said spray nozzle and delivery tube being detachably mounted in communication respectively with said fluid outlet and said air delivery port.

4. A detachable unit for a device of the character described comprising a combined fluid spray nozzle and air delivery tube permanently connected in fixed operative relation with the outlet of the spray nozzle ending in said air delivery tube approximately in the longitudinal axis thereof.

5. A detachable unit for a device of the character described comprising a combined uid spray 

